Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ff7d549ea7a3a7c0f2c6f885aa1d6ecd91fad0112edc77834cfd2d6807cc35' 
  AND token = 'RtHp3EUfmskRfDDk5Gs+6CD/gqgDM8IjrGFas9f5kTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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