SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0410222d5d53c315768bfcaec95be7747f82c10a5dc1079228f4d646d6698938' 
  AND token = 'pRZ7GSVC6ocNUJgV2tcGz8s/r8zKRBxap0Xw77+06ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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