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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d50171e0f5a2ecf38cf0c2b524ffaf0d8300aceaaa99f17824006ff0034c88' 
  AND token = 'Tyr2adn0A95rzFyYoEBZ4IOSl0M7okzIUhGoyU3dmzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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