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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28520c768124af9dbd12bd75c2551b02e785b6889cb0a7d43671fa727ef5216' 
  AND token = '2vk4deCOIzikFWgX0YnYco41yYxai0hCuE5KfXAiRes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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