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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5bd1c61fe475da8212b6766816ec6ce541cd1b346b82c16c0390866905a010b' 
  AND token = 'BUGAgpl4bNTU3pbZIeoC1D+IjxWEAT0o4aA+s7zwWIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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