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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd3aef818ad58c0d8cf0093e60cbe89cd019b4427e0215ca6fb72a6971ff698' 
  AND token = 'WrkD3MwiHR3jU6jL3lPdu6MvxXulCU0cupYEZKHal8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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