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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46c91f720b3afb7f481cd8698272a032a5c6cea6d6e470aa7b3aefa0f4bff13f' 
  AND token = 'WGZDhQWXUfxOQiqkkYeHjpuJgq8bCDJnthfIo9+qT6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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