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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56b4235f90e9c3bac7d655eba7aaed7d9bc03d744003759bb7650ad194d19f9' 
  AND token = 'khC+6Aj95c1GVBAYDQ1ccHY3xDw+xaWapi1lqKD/K4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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