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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb8ab6740507df0a67c452f6df99f97f266d82fbed63f3cadc3683ed2ebe497' 
  AND token = 'yrhWz6xGc9TtF6KtH/Zp/eI4ZJbewuWm1Wuh9C/7How=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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