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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e120a5b6b007eeaf3bab6f0019bbcb99058367fa169d0e8bf6e4dc98b01bea' 
  AND token = 'NOlFEeDSmdHq22zrNtYC2xfc5mGhK/rbmHpicTnKeoU=' 
  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"
    }
  }
}