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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86345d7b09d4f47e373088e5d7eaae9c4e758a3adc85d40a61882e6373a7073c' 
  AND token = '948QQHa/jZXQa8ztYlsAoWcdaZsPalqTJCd1eT5wyuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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