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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7218d60485c99ff548ae9340988ea99bb2ed4939a98fee943fc787b567236a8c' 
  AND token = 'dJRCSJS/+ICfEUKrsvr3BoZKpobby7gdeRh9+97iq+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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