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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae84709ee58f425a425f1b8278ac3a8093ac709a6ee1e7dbbb3f4be26974ace' 
  AND token = '47m9qDq119p8RUe2xo81vk4ee6sl2VU0HphMJhO4Ixk=' 
  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"
    }
  }
}