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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd2b6a2d2cb69a75dd572ee162a614c6bb8ed3d61d5b5eed5b8662d2443b39d' 
  AND token = 'MJJdzAZMYin0iTzKJjDUwG0qaikczJFBmD2yBKLucKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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