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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9937633af31f6f6bd2958e3101787bc59c124a7b9a6acabc50bd2f9ee3fe05' 
  AND token = '0Du6Z91GIYoW6h741A39PLhBaGBU/eVHibSKKVDRY3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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