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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b2d6cb6ea4c6820271e77871da007fe18db5ee95914fe6b43cbf7579198e72' 
  AND token = 'dG2WFdOLY0ObaCv/hu5YTDvHI9VFTTURwx0U9Sz04wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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