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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd07257a176f0a6b573c83c36142b21fc87c635fd65c4e9d4dce0dedce883ce1d' 
  AND token = 'BJwNpFatKEjmTn8SYa2Hzuf3yZNc9+krZ9Xoi1O1jBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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