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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5597b2a8c34e05d56bf59b7c2ec454887350f4606442612d20ec74fd63a05d55' 
  AND token = '1snSxlK4GwXtpXeO+QUrMsgPNT2g0cMh90UAuLWRRmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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