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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89047f21128bf2ac1e380c45b37a4bb7ae06cc5dcd17c256974e43378c1496a1' 
  AND token = 'SV4qPSdlsRSRkNjhc+SSbsvjDACZE57GZNL/vXd/7z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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