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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac931c448a45f0827aa6ec7acc903e333f0214201d2ab3db002d5c302e94b9da' 
  AND token = 'zkatTFeXb6eGVuv0V+2bkw7FEOB4ML74JXGaA2UEyag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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