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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a4160fcc86e39d790413b62185a8ace30ed3d36a4a4f7c5d52483dc24740eee' 
  AND token = 'pRnq+Oe/YEmF/tSTFHbv7anhM7Hina2O+Sa6U50TRE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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