SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7973619c6a4288f805946e4561341d92672023346e7fab74fba251c0b5eb6a' 
  AND token = '4ZRXSnzd394Eohu2popn8Gz/VlZ/xmsCG/Jp/j/z/4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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