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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d956d90dc74e9757da02902128cc6cd3c5fb4239aeaea23a79d57450a4fc11' 
  AND token = 'PEd+4Hu6rUPvW+q9GmBwKgK2USA1nyhM8o+64BDxSf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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