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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9342c52ea1c9163dfeafb6af6e0e2112f3d5425cf17375e4593bb761a3228d1e' 
  AND token = '30P1h6TclFg/gLcpS07/RX3hDkpahiJ2IiRJlAkDjlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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