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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c911a31af632ac6a821e5dc0c4db4a3de1b72f702ba9cb375fa03ca1b8a6228f' 
  AND token = 'aY731/RyP5h9fHzYZUNnL6tabnjVqrFxhEELdZZohAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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