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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1653524434d4cf2915190109504c9c5cb489a204ddae2a3cde773dea725582e8' 
  AND token = 'K6//lODXfJCjchfj6Pn8C2cZtxdz+ZIfzJMJ4C0GECg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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