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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa408967edfb4ee5c1dcc26a3a0b3af88e390cb653e8a95fd79fb1acd4508fa' 
  AND token = 'tJRbPLsEO6YYkG/96UWmR3UyB9AqUaF0BQz6iGaMEZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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