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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e4201e2fe69ad7b5f24e0e500bf85c980d2ce31e7a5a71f778442e1d1c7c12' 
  AND token = 'VIBtyjjJRltkCdkoTFoLYeIP6S/mQPr0tDw/rRn9BF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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