SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a1e73e294e0d74caa7bcc1cf7087c2486b68df0beca55689657b9129b5f148' 
  AND token = 'Y9LqAoqxjmHZs3qs0qL+l28HK/Oxg5lBYtum5D5IFsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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