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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd061e949598bf4dfcc2961575d5f963cb2ee76da5ecf88fdb7dfdb66cfb163f' 
  AND token = 'XDBq+NjOCrVR7snjk8RAszsJOLJjStg5ByFcRjnAsoc=' 
  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"
    }
  }
}