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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494c00c612e886ee88e1d5266ab022c84c97a5abb79344cc13e01d61d8513556' 
  AND token = 'jiIVUWZaevV2gD8iWgom3uzcjGry7RaeYsrZSxt52VU=' 
  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"
    }
  }
}