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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115c05b464276fe0e0ea3bea1b9dd1f879500a7de10381923d321453a69bb9bb' 
  AND token = 'JDLCpTPkvqiEkxSYl95inW7aRNIfHQkc8LNumIN09fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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