Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca720fb4233387d57299e7fc3a583d8d6e5fdf6610853045f88b2491439e9fe8' 
  AND token = 'ELuGxbofeCvGwrzXOmDEA5WUrjCMQM4z2acjv/pAaDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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