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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9e27520c4ec95abc4e60196f3166e6120f587fe8ccb88cf25179f43ce887e6' 
  AND token = 'u9iUjn6zXbNxn4vsi+PHt/y7AGi5YbQBZqER9gCGo00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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