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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57383d73be4b136977d3e1c50f83e7086278698b1444d9b82452a0e19a44f30a' 
  AND token = 'Osx76P93Z6JGHFymdHKQXLW+Ya7uRUwdPAzT5mCDrtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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