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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3db703a9adc2afdf0c156b1b8d453a45e0996fd9c2c0574ff851e51a92156a8' 
  AND token = 'o8v02Pm4Qa999+r6laKLAHmlFuMQ6MpAXUw/ZJqQ0us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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