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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a42d8d93ee95a19d274e46be1cd3db1e9514e3522b83ae95d1edafc2c203e14b' 
  AND token = 'pn+juYyfsYfh5pbdQnG3cyuoLzmTbzjfoX2TmCWAY2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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