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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a4cdd98eb833ffbc8b44dbcde4edde5b9d78c813ea05af2afc09f52e52cda0' 
  AND token = 'phAVy0/Ax9pGOn8673PflpjoeRDG88w1Q8ji7ncX59E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}