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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681ff84d0d5f78de59325310f345358564bd97bf215c9b8600feeec404ecfff9' 
  AND token = 'IrjImLhj+B6NU1wsgFHdoC6ER333JE+CHuTOpgcPffA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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