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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776df77f96a7a895ae060a261e1f7a53e2fd898bf452cc1bc871c0b1bd3af89f' 
  AND token = '2bp8RPp5pLorjeQqSWvRrjTR12GNzQWPYIlbE8Pj50M=' 
  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"
    }
  }
}