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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f511b1b1bc9a5c3d35206f776b6618e9861e421700f649de9357ab809f78a6' 
  AND token = 'HkCXl1jyw7TaZ4CEamEN2u2XpdhCvV0vZBatg4ITNf0=' 
  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"
    }
  }
}