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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae90559030ebb0033510205993f7aace71ed6da822b2e9e2b42aa4a96d5f2b28' 
  AND token = 'FikZYzUpLFSmbmEN4xyMEKSnhaehhqrA7h4uU7oDDwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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