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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb9a62ebd853c905bc50b87f9d80f22eed80a1aeac673484a9e72af5101ca7d' 
  AND token = 'gp3VlK3rXMCfXiEM3HCBgBDQorqL7IxS7t9UKyHQ9vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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