SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676771400df2244941b04785cdaf4a0790ebba572e53e137449031feab12500d' 
  AND token = 'FL3gr8NOqMc5OUiQz+VYrXrhX61Hh29Ws5PRKZ8KGSA=' 
  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"
    }
  }
}