SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43acbd4e63f856fc2767ac287811cb0a631eeab0d553133a7a4d963417a9287f' 
  AND token = 'Sk9dQKERUvKcSuwv5HQqjmz8sC+r+LxsBwGVSts5ClY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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