SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c221892dd0fd996a8c3660fd87492f71527f8948f4df3b80914cfc5cc965ff' 
  AND token = 'mazP9gBnzeGukJp/VFSKMXPQNL8Wa9nOOOJG4NYLIsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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