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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a9970268912a74d016c41c4509e03b7afe8798f00a9edfe539083989c7feb0' 
  AND token = 'b5UJDGjCk7erTmPetH/KeW6rJ4J/uBV7bPkswovECZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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