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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc020ff76bdca56d7cb13e1fa9bbe50462c1ff17fe2fb5bc428ee83c39fcf18' 
  AND token = 'wUr47jy0GqUoj5sVrZzZCQssKBSo99D0bDX6JzNB6m0=' 
  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"
    }
  }
}