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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617edf712230e0c022e92ec4f5a8a4d1447ca5e572549a99e0739ba252aa873a' 
  AND token = '1yFp+g7XLKpxK9eFtG0j67CHJKHesY8TvZKHCmj3hPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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