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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f9ca4e7729eb7f66887560e13319ac59ab4ad1818764ed84d2754ada5146a5' 
  AND token = '/xL36ja/5qNOo8B78LZwmN7kefTOnaU8/XWvefi/hYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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