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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d4e683c2b72f79e8f6f163fbb1df29d9658447bd0245f04bb3c2ab98d741e2' 
  AND token = 'sLf3I8LnRbfb2MGyP/kciEcVlqd0br5IrDKfJyCulaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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