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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d7798db3460df8445a12ea934f05a05404b4d52aa25c0fd21795d66d8326c7' 
  AND token = '6vikvJU6B8CBZFp2xY2TC2HWPD9iSyEv7V8Q0Poo6rg=' 
  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"
    }
  }
}