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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac3ef552dde13d2e36d4df842cd54664708a6d3d34773df3c6b8d28cc89d9b7' 
  AND token = '4xCgp39YALMesnr7NwHznEERgJGm9Gyu4oeQXXqDx2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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