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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba228c7c2ddcb644e6da6e76f6a36b2ec27c1f35092becf8015465303a01927' 
  AND token = '70N6WPkHEjhf8/qYw5krAl6dUuVi/pw/8GaHUVRo4/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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