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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df41174b75a9f2bff631fb2467656bd5b6f1e187c3e6b7842d2d46267255c6c' 
  AND token = 'RJXQeu16XFje5sO3b1X/Q+IkI83BL5nuM7lNBjVIM/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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