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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba5a055943f7eaa682235778a4ff4f2cd44771a10f50849c6335ef16023629e' 
  AND token = 'EoxRgpe1yWeanqQy5eXGLdfv2WsOxCi0pkjeoaqOywU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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