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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21af0ad8c53e2b6c605c23de11740be2c78753e3cd98c4f732c35abdd0df6258' 
  AND token = 'Jk88r/nQykGsu4/+ucF3WsJSzOj3tg2SWNf0gqwc6ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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