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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef34a988f6583e78b9e361e22f3b6d0e09fe0c4e5cb043d4323063c1670497d1' 
  AND token = 'F71cASYe/wMPhKZdS0bWSVRvxUKQ6F7N26+ujXMwx6I=' 
  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"
    }
  }
}